MAX881 Maxim, MAX881 Datasheet - Page 5

• Manufacturer Part Number: MAX881
• Description: Low-Noise Bias Supply in MAX with Power-OK for GaAsFET PA
• Manufacturer: Maxim

Dual-Mode is a trademark of Maxim Integrated Products.
Figure 1. Functional Diagram
PIN
10
1
2
3
4
5
6
7
8
9
C1
C2
NEGOUT
NAME
SHDN
GND
POK
OUT
N.C.
C1+
C1-
FB
IN
_______________________________________________________________________________________
NEGOUT
C1+
C1-
0.5V
Positive Terminal for C1
Negative Terminal for C1
Negative Output Voltage (unregulated)
Active-Low, Open-Drain Power-OK Output. Goes low when OUT reaches 92.5% of its set value.
Active-Low, Logic-Level Shutdown Input. Connect to IN for normal operation. Do not leave this pin
unconnected.
Dual-Mode™ Feedback Input. When FB is connected to GND, the output is preset to -2V. To select
other voltages, connect FB to an external resistor-divider (Figure 4). Do not leave this pin
unconnected.
Regulated Negative Output Voltage
Ground
No Connection. Not internally connected.
Positive Power-Supply Input
CHARGE PUMP
0.4625V
Low-Noise Bias Supply in µMAX
with Power-OK for GaAsFET PA
SHDN
FUNCTION
GND
MAX881R
Pin Description
OUT
POK
FB
IN
C3
C4
5